The influence of polyether additives on performance of ultra-thin Li-ion battery copper foil with thickness of 5 μm was studied by electrochemistry,scanning electron microscopy,and X-ray diffractometer.The results show that addition of polyether additives into electrolyte can promote negative shift of Cu deposition potential,and polyether additives with suitable concentration can lead to finer grains of copper foil,which is conducive to improving the surface flatness of copper foil.When the mass concentration of polyether additives is 2.3 mg/L,the obtained copper foil has tensile strength of 620.43 MPa,elongation of 3.67％,glossiness of 161 GU,and surface roughness of 1.02 μm,presenting excellent overall performance.The electrolytic copper foil with high tensile strength has a preferred orientation of(111)plane.
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